Triggering of substorm expansion by the IMF directional discontinuities - Time delay analysis

Details Triggering of substorm expansion by the IMF directional discontinuities - Time delay analysis Triggering of substorm expansion by the IMF directional discontinuities - Time delay analysis

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34.1109s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Nov. 1986, p. 1109-1118.

Computer Science

32

Interplanetary Magnetic Fields, Polar Substorms, Time Lag, Bow Waves, Convection, Electric Fields, Magnetopause, Polar Caps

Scientific paper

Time delays in the response of polar cap convection and triggered substorm onsets to the sharp and isolated directional discontinuities (DDs) of the IMF are examined. The superimposed epoch procedure used to analyze the variations of the IMF components is described and examples of IMF DDs are presented. It is observed that there is a ten minute time delay in the response of the ionospheric electric field to the sharp B(z) changes and the onset of substorm expansion triggered by the IMF B(z) component occurs 4-14 minutes after initial contact of the DDs with the bow shock. The data reveal that delays in the polar cap convection are not caused by the orientation of the DDs; however, the time delays in the triggering of the substorm onset are dependent on the orientation of the DDs.

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